21526457033451 has 8 divisors (see below), whose sum is σ = 28701992055184. Its totient is φ = 14350946683680.

The previous prime is 21526457033449. The next prime is 21526457033491. The reversal of 21526457033451 is 15433075462512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21526457033451 - 2¹ = 21526457033449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21526457033451.

It is not an unprimeable number, because it can be changed into a prime (21526457033491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4025860 + ... + 7698081.

It is an arithmetic number, because the mean of its divisors is an integer number (3587749006898).

Almost surely, 2^{21526457033451} is an apocalyptic number.

21526457033451 is a deficient number, since it is larger than the sum of its proper divisors (7175535021733).

21526457033451 is a wasteful number, since it uses less digits than its factorization.

21526457033451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12335981.

The product of its (nonzero) digits is 3024000, while the sum is 48.

The spelling of 21526457033451 in words is "twenty-one trillion, five hundred twenty-six billion, four hundred fifty-seven million, thirty-three thousand, four hundred fifty-one".